Objectives Low response rates in epidemiologic research potentially lead to the recruitment of a non-representative sample of controls in case-control studies. Problems in the unbiased estimation of o
Abbreviations: DM, type 2 diabetes mellitus; IQR, interquartile range; MESA, Marshfield Epidemiologic Study Area; BMI, body mass index.aTreatment data for colon cancer, only available for subjects in
Note: H. pylori infection data missing for 78 controls and 27 cases.*P-values from Student’s t test (continuous variables) or Pearson’s chi squared test (categorical variables).# Matching variablesCha
